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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e695b49f02e097d0d1592ed3bb8ae1213566b6dec9da1f2f00d56a0192f776d' 
  AND token = 'xy8pf5GL+PMam2youVvYto4m2/3OzU3Ap5gtd5AtFpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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