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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a709f8687d5a8c68b0832af20ff64849b101cc39f14979de8581387310084b7' 
  AND token = 'jsUafqo3VqvjYllml6zfTjELHBVYe8OEzOQsR/gsSLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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