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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ac30ac9fa05fef04c48bd43610c3d6f3e03d68d6eef8b40dde4614573dd064' 
  AND token = 'KrELk6VgCjCcfTKQTLMEt1BVoiWqOaorJa7FpVaX9xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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