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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e030d0aba1765263a05f502f35fabed6835cf574d514a4190240c39fcde34129' 
  AND token = 'KKtyhse/zSzJ5PMDEb+6xMPSlg9r1x55gLO4zctwVgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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