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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c468e08645ccbe9e9dc5f6f719ac9dccc17c7e8fa2d4554793b824f3eb6d0980' 
  AND token = 'PNm16AtldJnOQfSGZ7YktSrbzAA3smvJS0mDHW39wcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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