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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309a1af67236ca9fa191531eb151fc97df0440178119ebe2c9a5be0641c9865c' 
  AND token = 'yzdLQCoBmJNg3DztEZDSaVh65dNn9WeGWlpTSQathI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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