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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcdc7b14e178fc97942a0151330f00df8cc9f06de63a57abb5ba36dd6f80f46' 
  AND token = 'Vzvo4SUj4Z1O7ij53TMErJvtY3NHDcHun64HN3h3Q4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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