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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b694b96bc08cccf33f72c997432e7b62f0c6023cf9177ff652a5f455de05fda' 
  AND token = 'Tshgzv/Jp6WAtTXtDv8h4EBYbQmre0ejJUfppS9AmsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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