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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414408a002f55803f4c9a3951b60b4667ed99cfa33f9344253b49191d2bf4162' 
  AND token = 'azBehENCpfCjxSxeCCzGPMb/fHF+4qedAavNzfbNvXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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