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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd6ff1ad11ac1bae6ac14bfd6d7cbda9eaff3e2715c2868d14627eed44263f8' 
  AND token = 'AyhaNqaHmBydlmU25qBf6BO2yTGTuK+Peuk32cr6HLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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