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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e021f022c4f34fc5cd7289e9d343800d8883cbba0dc4f3a4f027486d18cd2033' 
  AND token = '7Si0zLfeygeDFSUOGjmttPE+Wh+nu6471mEDyGTf81U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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