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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7544a7332a83de0f2a9b8a77805d5aac318657809ae067e7549465d5e56a175' 
  AND token = 'WZ0xyfbPZuxslaT6sJmmSUWeKWazCe+gMaPjI8n13C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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