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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc03c042cb92426ada8461533a50eef548fe91a3d003b5594bb5264f04d2668c' 
  AND token = 'KHXAQAYxY9ztp48VuCPTKF8eCSCmb2AaubPQzPd+3VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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