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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab41965af6f0db8354dd22fca49b4068ea2e09dca34a8ed635a2bf9cc90588af' 
  AND token = 'nNsehabnmK2ZAEzyl7+pzDGJX4sga68z72QwdIdxOtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}