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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ef05227dcd5e617746087013ced39699716acc8d41bfb262b09f49a478a0ce' 
  AND token = 'ocT7nAoaxiFkVSzAwMBVtvMqIN+zcawnjhtrIm+vr5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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