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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64c495fae7196fba0b15fd7b6c70ffc2912795a6507fe7bd94369a80f46fd06' 
  AND token = '7qSGmtXQQ2U/+PZOwtC7U6n0+fKrdIlPDUpN0xc1te4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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