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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c9df6e1769332d7529849805eab5b8ddbd2098a375d70672ba3fb0447af9d7' 
  AND token = 'kLQErku5UpnOTK2Sk/LcpuLyfpJHaRQEdBIDPhP9868=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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