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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27bf97263315bbbb42b3b2c05452ea8facda44ca47173c47dce8038d0270ae9' 
  AND token = 'OkhhwLOBD9cnF1Vhnh5NfC0b34HoEoZT9EilQsGBlic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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