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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9042a94967697c95c37b0a9c8424880dc0f55c33ca3202d9a1d87d1e4ebf6f' 
  AND token = 'D/b8TKYKKkPE7ZFIqtvFV1+mk+lRWA3myRM0hkNAuWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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