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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b028436fe97ee2d97944aa904f89cf76aed55acc991f359e6759ff4c8cf500' 
  AND token = 'KpbVFqihWyvTyl6DduCvIzVBjf4gFl/xhzIhberM1p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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