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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5694f77b8fa01b5d1704ef07aebf83956fffa0a09988dcec4a2e5fdb8a01ad2d' 
  AND token = '+GN/l5XGV3KjjtYVXtPjYiVpe5fUkch9uo4Ea7lTA4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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