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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be6420906d76f733cc594cdd7093b97fe53db7a1015fd9aafdc8854033ae72c' 
  AND token = 'ONQRIMam9ruErJArERbsqnIij9vgTma1/Mn0nD+4v74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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