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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20103dd687e160332b7be736efb50df5fcd14c3872e1b8158195c4ff09a1410b' 
  AND token = 'KhmvDQL+fScTcU5E9tz9ND81Po5aRlcSAntu9ry///o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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