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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dcec846cfc03d5ff30be785d55346a4fba5d044a91e9cadb36fd7807815d6d' 
  AND token = '+vABkIVp3V2k3FODcTSmx0C4nNyGXm8jlsL1MTP/mQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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