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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84f761edf5c19a4a5f587cda82d1b5a7de6c97e86a0736b197ed787236e3f99' 
  AND token = 'Km2zVHYF0X5igmjvjyjAA5RZmbFpp+eb60cufNvu1mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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