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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28903eba026d9d45ad5779d40e85ec238ce0aa3336bdce0681fad25eafc2a525' 
  AND token = 'x4HGYCODDYhSy81NW4dqu+YZfMkn+ndPTBh6uCYYnNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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