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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2667c072484618fc07176a9cada56ba267a86c083b4cb98302179e2eba43b176' 
  AND token = 'vqwRRTCXQRIM4sP6hTrXWPQZOH4bMm/8SGgyh6YLB2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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