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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c39e8dd6afa6f55438158380d907b25bf88552a993fb955334c3dab6f05314' 
  AND token = '6EMeMURkKcphCuTJb4AisAjb6gXPSpF/yn6xJrXYdJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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