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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb8b704cd06a16f3d1143a9fc7eaf59b67ac2ceb676683e2c3bc1011c68dc75' 
  AND token = 'Hn1QFVtb5FJzdtIITOD7rbDiNEGybGt67boQL+WNhgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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