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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfd8a23d857eebdb854e90910fe74520492679a347ec128d45057ba4e97f6fb' 
  AND token = 'sACuhk/Qbknp7Bn/GOiLHVFx/UZ/98hC55j37yUVIu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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