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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61ee744e64495b7d79b2845ddf3487f75ae529ffc14b4a0096a27db964e307c' 
  AND token = '4VnO4YGu4IyQEFsUvB2iUgoX8cHIhG1xxzCC8YSskJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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