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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb7806844e57ceef3449d40190e953b16742e450416364437c03cc940fec651' 
  AND token = '5YMnCjV1LJDfSi7S12i/Hplltyr8yw/WJNzJLQMsoXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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