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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea3e63b7b24fe77e184e62839b05fe39ec5209033f024b3ad57b35d06f2fec6' 
  AND token = '4LD9sHbPjcaXcZ5PWbF8mhf6RPlUedE51xSw07hGDsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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