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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9421f88941caf2d76d32051330430a89c8ee6ec208d2b6e9db4b171d75d0fcc2' 
  AND token = '9pJcmUti6YY9WsYLsq9/puxgjJWDWzX8kvbyrfp6e0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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