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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928bb85c766c00ff4c0264ca5772a2c8e4868942f2fe5ad4a5c73f9748c43cb0' 
  AND token = 'zMBOif1W/wuRmauU6foTn7c2IQ7h2i1rps6JgNaeHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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