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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8f9761923f25f71e9ef7e3e7155e7d3ef95b3f5d95918e38a755204c33673d' 
  AND token = '5PXCa7gDT94jiquRrX5PaESyKoNjEHIhN1K1sYFj9ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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