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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1807cd8a167d24194dac061b3f5d8c6f5d29808a3c6d664f8659b021ff7528' 
  AND token = 'L35JafdytEovVAcVuhDC+ESmn/sCAMDNWF0ZqRFPoDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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