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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218c0b712a43eeec97f9dc44f89cfb23618c666af26ec4d1a01dd0e7767c2440' 
  AND token = '+8fFswdWiM3ZVcxyKWQF2cm4QQe3RE3bEDNZD+vraPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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