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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192fdabf2906908a502b65f0f886a240410c970294ec11920a274576eb9e3f1f' 
  AND token = 'VMByvnPER3KZb3CI9cXAN5376u5j/JAGVUf2f6gpbdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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