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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba0351807ca5712a6cad91c8f24c7d0cbebffad19c04a5c2c3411ab3344340b' 
  AND token = '2GViqp4WImFzsEVPXzGV7pYOnGa8gMYJitjpgkxIIGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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