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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b504752456800ee6c1ee8258f94c2e1176bee3e6b93a05459da61bfcd9507b23' 
  AND token = 'tHlnASls8+HK7Ud5YWSk0+FUHi0eX9yy3S5z7LVKgSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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