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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93697df43df746ecd015575304c527b3f37516412b1bfb00d8c858e8dd50d820' 
  AND token = '+yDF7CTKb0du69ZSI3dQoON5udSCma9Cm3JXcnSQjkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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