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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b0ab0e37570fb6903b1d6610a6af1f6579dbf78b9b25c6ef2f05da3e054cdb' 
  AND token = 'UdSYp9IkJ5f5Fvy1QBwS8tENmsove6m1hqbdHf/W7Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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