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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0640af09c332a6221d699e66a88d601374ce1511f50da3b051738fedd6f8cae4' 
  AND token = 'LjL9U7qz3I88vuawycPO1cMl1bBOt+CboUTkERGS/9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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