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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50d885ee2a1a4f153aa06b6290f377393cb9bf98c8faf4ef2a0f845ab924985' 
  AND token = 'sakGxiv53dSCW75cKxvAQ5f+3OWdjST5Y8EoHXSwTjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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