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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d795882659106e4839fddee18cb70e17df02b9a8eb725afce2e88ed0be859c4' 
  AND token = 'R0BvCEqSPx/LT0cu3+glAbSV0Qp6fr/QYvWop4ev8tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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