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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4581d2f129e2e999d920a9a405d30a01cc5a61098ec39107aeb44fa7eedd43d9' 
  AND token = 'eKfHoaJWigswg79owS4yrlJ8cjv2/HCoN9TI0YX1R44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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