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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf510071a24efe798bdc9dc3db8eebc84ac0459e5c6f25e8fdcea18b6fcb9f12' 
  AND token = '3GhDPMgzM4bzC1dbH/PbKUbKDWprIu3Mqidw1gbv8Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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