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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5236b4f5761d413f4220748527290a31ecfd6cbbc8b50892bd5ab4218b5c3832' 
  AND token = 'h0hIHxc6ACPxbB32MHeeh+B7zvi9q0saBZHPlSeF2bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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