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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8e397a0e366e90fc8756aa0249ed598e3f851f4798a00c89eda8f5931444cf' 
  AND token = 'pIpivogd6+/075O2bNk8tFSf6Hj3OKVAn9/1yyOiQeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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