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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f638aaea04a762307f004843d9440379c3aff5b3d1b97517658e51d9188ca39' 
  AND token = 'KGSS4ZvDxIXfC0sBf/oFq/5Y9oR547y7O6GqZeGVjDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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