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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '130713e18c1dc6d3347d5a8bfec8eff8b67a7205ce3f44700787c4f599a2ee47' 
  AND token = 'ERAs7nrxSQYQL+y4zxElY31tTunJVxEbNM+udDBi6To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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