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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a6738e2cba6ac7dc2b2bdfd54d7ae789c278830e716b398f8b450fd570d35b' 
  AND token = 'g3sunkYF2IDW1CFkVhkFiZIctgepBt8OceTl/zu9zn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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