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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9db6f0870e4d88cd5429b4586869c3547e605b8783430c69829cf22bb3e485d' 
  AND token = 'juSH0JrqERRPYQ9KV+i0CNv92oEQornW6Zj48ktdiNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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